Question

Carbon , silicon and germanium have four valence elcectrons each . These are characterised by valence and conduction bands separated by energy band - gap respectively equal to ` (E_g)_(c) (E_g)_(si) ` and ` (E_g)_(Ge) `. Which of the following statements ture ?
A. `(E_g)_C = (E_g)_"Si"`
B. `(E_g)_C lt (E_g)_"Ge"`
C. `(E_g)_C gt (E_g)_"Si"`
D. `(E_g)_C lt (E_g)_"Si"`

Answer 1

Correct Answer - C
Carbon , silicon and germanium all are semiconductors and `(E_g)_"Si" gt (E_g)_"Ge"`.
But `(E_g)_C` is very high and `(E_g)_C gt (E_g)_"Si" gt (E_g)_"Ge"`.
`therefore (E_g)_C gt (E_g)_"Si"` is the correct choice.